1SDA056346R1 ABB E3H800PR121/P-LSIG 800 A 4-Pole Air Circuit Breaker

Why Choose the ABB E3H800PR121/P-LSIG Air Circuit Breaker?

The ABB E3H800PR121/P-LSIG is a high-performance four-pole air circuit breaker (ACB) designed for reliable protection, switching and isolation in low-voltage electrical distribution systems. As part of the proven ABB SACE Emax E3H series, this fixed circuit breaker combines an 800 A rated current with a PR121/P-LSIG electronic overcurrent release for comprehensive protection in demanding industrial and commercial installations.

The PR121/P-LSIG trip unit provides long-time, short-time, instantaneous and ground-fault protection, allowing the breaker to respond effectively to overloads, short circuits and earth-fault conditions. The E3H high-breaking-capacity design provides dependable interruption of substantial prospective fault currents and supports selective protection within complex power distribution networks.

The ABB 1SDA056346R1 is a fixed four-pole E3H 800 breaker with rear horizontal terminals, an 800 A rated uninterrupted current and a rated operational voltage of 690 V AC. It is supplied with four auxiliary change-over contacts and circuit-breaker open/closed position indication, making it well suited to main switchboards and high-current distribution assemblies.

Key Advantages

• High-performance ABB SACE Emax air circuit breaker for low-voltage distribution systems.
• 800 A rated uninterrupted current for substantial electrical loads.
• Four-pole configuration for four-conductor switching and protection.
• PR121/P-LSIG electronic trip unit provides comprehensive overcurrent and ground-fault protection.
• 100 kA breaking capacity at 400–500 V AC for demanding fault-current conditions.
• Fixed-mounted construction for permanent switchboard installations.
• Rear horizontal terminals simplify integration with switchboard busbar systems.

Key Features

• ABB SACE Emax E3H series.
• 800 A rated uninterrupted current.
• Four-pole circuit breaker configuration.
• PR121/P-LSIG electronic overcurrent release.
• LSIG protection functions: long-time, short-time, instantaneous and ground fault.
• 690 V AC rated operational voltage.
• 100 kA Icu at 400–500 V AC.
• 85 kA Icu at 660–690 V AC.
• Fixed version with rear horizontal terminals.
• Four auxiliary change-over contacts and open/closed position indication.

Reliable Protection for Low-Voltage Power Distribution

Air circuit breakers such as the ABB SACE Emax E3H protect electrical distribution systems against overload, short-circuit and earth-fault conditions while providing dependable switching and isolation. Their high interrupting capability makes them particularly suitable for main distribution points where prospective fault currents can be substantial.

The PR121/P-LSIG electronic release provides adjustable protection characteristics for coordinating the breaker with other protective devices. Long-time protection responds to sustained overloads, short-time protection supports selective coordination, instantaneous protection rapidly interrupts severe short circuits, and ground-fault protection provides an additional level of protection against earth-fault currents.

Typical Applications

• Main low-voltage distribution switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical installations.
• Manufacturing plants and process facilities.
• Power distribution centres and electrical substations.
• Generator and transformer distribution systems.
• High-current switchgear and control assemblies.